Quantum Physics

Title:Quantum Bilinear Optimization

Abstract: We study optimization programs given by a bilinear form over noncommutative
variables subject to linear inequalities. Problems of this form include the
entangled value of two-prover games, entanglement assisted coding for classical
channels and quantum-proof randomness extractors. We introduce an
asymptotically converging hierarchy of efficiently computable semidefinite
programming (SDP) relaxations for this quantum optimization. This allows us to
give upper bounds on the quantum advantage for all of these problems. Compared
to previous work of Pironio, Navascues and Acin, our hierarchy has additional
constraints. By means of examples, we illustrate the importance of these new
constraints both in practice and for analytical properties. Moreover, this
allows us to give a hierarchy of SDP outer approximations for the completely
positive semidefinite cone introduced by Laurent and Piovesan.